#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int n = 0;
	scanf("%d", &n);
	int count = n;
	while (n / 2)
	{
		count = count + n / 2;
		n = n / 2;
	}
	printf("%d", count);
	return 0;
}